
"haven't you done this with your friends before" I've seen this line a lot in BLs and I'm genuinely curious as a girl... Do boys really masturbate with their friends? Or is it just something that happens in BLs only

No, especially with long-time friends, they might sometimes glance at one another casually out of curiosity or habit, but it's usually not a big deal. For close friends who grew up together, there's often a level of comfort and trust, so such situations tend to feel normal or nonchalant ¯_( ° ʖ °)_/¯
Mc (uke) is a really confused person, one moment he's rejecting seme and saying he does not want to associate with him... The next he's yearning for seme and wondering why seme has not contacted him smh