The moments between the Winx and the Specialists in episode 2x25 just before the Winx go off to rescue Bloom. Especially the moment between Riven and Musa:
Musa: I guess you're above all that mushy stuff, right Riven? You don't need anybody? Yeah, so anyway... (Begins to walk away, only for Riven to suddenly grab her arm and hug her)
Riven: Do me a favour. I just wanna hear you say that you'll come back. That you'll come back, to me.
- Thankfully, 4kids did not ruin that scene and it's just as heartwarming in their version.