Help

okay so there was this one yaoi I read and the mc switched bodies with his neighbor/friend and his friend is a sex addict and they end up banging each other and the next morning they switch back but then plot twist the friend was bottoming only cuz his thing couldn’t get a full erection and so they do the shabangbang again but in their own bodies and the mc ends up bottoming again. I know it’s a weird plot but yeah. the mc was taller and the friend was shorter if that helps? I’m pretty sure it was just an added side story to another manga but i’m not 100% sure. I’m just trying to figure out if this was an actual story or if I imagined it. sorry this is so random and vague.