This is played with occasionally in the later manga, typically in a Not What It Looks Like context; for instance, Urd pressing her open mouth to Belldandy's ... to suck out an "Ahem Bug" causing laryngitis. (The sight paralyzed Keiichi.) More recently, Urd briefly messed with Peorth's head by pretending an accidentally swallowed potion had made her fall in love with Peorth. There also a scene where Belldandy was seen in a liplock with Peorth, doing the magical equivalent of CPR, which of course looks wrong and actually freaks Peorth out Belldandy was trying to suck a water spirit out of Peorth's body.)
Sayoko and several other girls were clearly thinking Les Yay in an early manga chapter when Urd hooked a finger into the top of Sayoko's swimsuit and pulled it open to take a good look inside. But...
Some fans see Foe Romance Subtext between Urd and Mara. It gets better when a clone of Urd is threatening to destroy Urd, and Mara shouts, "I can't lose you! I still haven't beaten you at Tetris yet, dammit!"
The second season of the TV series has an ending with various couple together, symbolising various relationships in various stages. Keiichi and Belldandy, Skuld and Sentaro, Keiichi and Megumi's parents etc. However Megumi and Sayoko are shown in a shot together, walking with one or more female friends. Given the theme of the rest of the shots it does seem to imply something.
Hagall has some Foe Romance Subtext towards Belldandy especially since it turns out her Evil Plan was intended to turn Belldandy into a demon.
Sigel towards Skuld. The first thing she does after becoming sentient and being repulsed by Banpae is show that she is FAR more interested in Skuld.