A character wants to feed, drug or poison someone else, but the target is not having any of it. So, in order to make the target consume the desired substance, the perpetrator pops some of that very same substance into their own mouth and kisses their mark to force it down their throat.
For some reason, the perpetrator never seems to suffer the adverse effects of putting potentially harmful substances inside their mouth, although this may be justified if the drug in question is beneficial in nature (e.g. food or medicine), or is encapsulated in such a manner that it would only take effect after being digested.
Given the intimate/seductive nature of the process, this could characterize the perpetrator as The Vamp or a Femme Fatale. Meanwhile, helpful transfers frequently overlap with Intimate Healing and invokes Ship Tease between the parties involved.
Sister trope to Drugged Lipstick. Compare Sleight of Tongue, in which the kiss is used to transfer a lockpick, weapon, or some other object to a captive hero that would help the latter free him/herself.
- Towards the end of 009-1, Mylene is captured by the Eastern Bloc. She manipulates the guard into kissing her. While their lips are locked, she tongues a Cyanide Pill into his mouth. After he falls over dead, she picks the locks to her restraints and escapes.
- In The Movie for Ah! My Goddess, a younger Urd uses this technique to force her sister Belldandy to swallow a "medicine" that will cause her to forget her mentor Celestine and the crimes he committed. Urd not being affected my well be justified, as it's long established that spells and such in their world can be deliberately crafted to specific individuals, meaning the Laser-Guided Amnesia would only happen to Belldandy.
- Blade of the Immortal: When Makie is on the verge of collapsing due to her tuberculosis while being surrounded by Kagimura's men, Manji swoops in and kisses her after drinking some tuberculosis medcine, allowing her to recover and immediately kill her opponents.
- Case Closed has Vermouth bite onto the APTX drug and kiss Mary Sera in order to force the latter to ingest the drug.
- An accidental example occurs in Chainsaw Man during a drinking party: Himeno is giving Denji an open-mouth kiss while she pukes up her beer and dinner into his mouth. Unfortunately, Denji is used to eating extremely disgusting things reflexively and ends up swallowing it.
- The titular character of Cross Ange is tricked into drinking water that is laced with a laxative. One kiss later, and Rosalie, who placed the laxative in Anges water, is stuck on the toilet for quite a while.
- Danganronpa 3: The End of Hope's Peak High School: during the final murdergame, Ando and Izayoi come across what seems like a door leading outside the building, only for Ando to use the kiss to slip a macaron into Izayoi's mouth, thus triggering his Forbidden Action, and by extension, killing him by doing so. He's completely fine with it, though, but she did do it because she thought that they were going to activate ANDO'S Forbidden Action, thus forcing her to do it because she thought it was going to save herself from death.
- Delicious in Dungeon: Played for laughs when the orc captain helps to heal the wounded party. She force-feeds the unconscious a grotesque Healing Potion made of ground-up frog legs, tentacles, herbs and other unknown ingredients, and it does seem to revive them a bit. When Marcille's turn comes up, she desperately tries to convince the captain that she doesn't meed any medicine... but is too weak from mana loss to stop her from getting the same mama bird treatment.
- In the Ancient Egypt arc of The Doraemons Special, Nobita faces a Brainwashed and Crazy Cleopatra and is told to either give her a medicine that will undo the brainwashing or shoot her. Cleopatra won't take the medicine (being brainwashed and all), but Nobita can't bring himself to shoot her, so he takes the medicine himself and gives Cleopatra a kiss to administer the medicine.
- Fushigi Yuugi: In episode 18, in order to prevent Tamahome from leaving her to go back to Miaka, Yui forces Tamahome to consume the kodoku pill from her mouth while he is held by her servants.
- Futana from Futaba-kun Change! kisses Futaba so that she can throw up in his mouth because the toilet is too far away. Did we mention Futana is Futaba's older sister? Yeah, she's a Jerkass.
- In Itsuwaribito, Gin finally reveals his true nature to his fiancee, Rurihime, by embracing and kissing her, then forcing her to swallow a small explosive that would blow up at any moment, before pushing her off a tower.
- The Seven Deadly Sins: Ban's backstory involves both him and his love interest Elaine being mortally wounded by a demon. Ban insists that she drink the Fountain of Youth, thus gaining immortality and saving her life. She does so and gives him a kiss... forcing the Fountain into his mouth at the cost of her own life while he gains the immortality that he has for the duration of the series.
- Elementals of Harmony: From My Little Praetor: Phthisis is Magic: "Instill Infection", talking about kisses:
As first kisses go, there have certainly been worse over the history of the Multiverse. There have certainly been better ones as well, many because one kisser's tongue didn't sprout a stinger or inject the other kisser with a potent narcotic.
- Princess Mononoke: After Ashitaka is injured to the point of almost being unable to move, San tries to feed him some dried meat so that he can regain his strength but, even then, he's too weak. This leads an annoyed San to chew the food and feed it to him mouth-to-mouth in one of the more tender moments in a brutal story. Possibly justified in that San was literally Raised by Wolves and this might be the only way she can understand to do this kind of thing without any notion of the significance of mouth-to-mouth contact between humans.
- In The Annunciation, Eve ensures that Adam shares her damnation by pushing chewed-up apple bits in his mouth while kissing him. In this case, at least, he is aware of what will happen and accepts it, as he loves Eve and does not want to lose her.
- In the 2013 film adaptation of The Great Gatsby, Catherine forces Nick to take one of her "nerve pills" at Tom and Myrtle's party by planting it in his mouth via a Forceful Kiss, then making him drink to swallow it.
- In The Handmaiden, Hideko tries to drug Fujiwara by pouring the concentrated opium into his wine glass, but he simply does not drink any of the wine. She forces the issue by sipping from his glass herself, then kissing him and forcing it into his mouth.
- An episode of CSI: NY has a man drop dead after sinking a winning shot during half-time at a basketball game. A few years earlier he'd mocked someone else whose name had been pulled. The killer is a Formerly Fat woman whom he once started a chant to "eat a salad" (which blew up and ruined her life) when her name was called. To get even, she'd gotten in shape, become a cheerleader, taken the antidote to a poisonous plant, rigged the lottery, and spat the poison into his mouth via a kiss.
- Divinity: Original Sin II: Radeka the Witch forcibly tries to kiss the player character so she can spit insects down their throat, thereby weakening them, at the beginning of combat.
- At the end of the first chapter of The Legend of Heroes: Trails in the Sky after Joshua explains his past to Estelle, Estelle confesses her love to Joshua and they share their first kiss, which Joshua laced with sedatives to prevent her from following him.
- Worm: A beneficial variant, in the Prey arc. Panacea uses her power to create a counter-agent to that will be able to cure the agnosia caused by Bonesaw's parasite, and will be spread via body fluids. As the first person to receive the cure, Taylor passes it to her teammates by kissing them.
- A mundane but benevolent example: Alicia Silverstone famously fed her son this way when he was an infant. Before her son was able to chew or eat solid food on his own, she would chew his food and feed it to him directly from her mouth.