Okay so this is a huge longshot but I'mma try.

Ages ago there was this webcomic or online comic, it was Korean maybe? The main character was a girly guy who got bullied in school for being girly. His bully was gonna spit on him, so the girly boy says spit in here and opens his mouth. The bully obliges and gets a boner from watching him swallow it, he's then compelled to fuck the girly boy passionately and repeatedly and they end up falling in love.

Anyone remember this? Pic unrelated.