...so I guess Rina has branched out from computers and electronics to pharmaceuticals, and almost immediately goes pro. I'm a little unclear as to whether it's just a futanari drug, or if the others' behavior suggests that Yu is also giving off Generic Protagonist Fuck-Me Pheromones, but either way, I'll take a case.
(Rina's been chatting online with Cinderella Girls's Shiki, hasn't she?)