Hmm, I guess I don't see it. It looks like 'juices' to me. I usually notice the blood on the first penetration and the guy usually asks the girl if she is all right, and the girl usually asks the guy to go slow. Maybe it is too subtle for me, but I like the idea that she loses interest after they fall for her seduction.
Dumb question: If she doesn't want to be the Mommy in the relationship, wouldn't it have been smarter to have sex with him while pretending to be the baby herself? You know, like the girls in the two (?) stories on fakku who have exactly this fetish? And he would have taken the role of Daddy and both would be happy...
Mama Michiko fanclub...
Though I think it's partly her fault since she was spoiling her Senpai rotten when they had sex, but...Oh well.
Interesting premise though, I must say.