The problem is, those girls are probably terrified of the reality of actually being mounted by a man like the softbois in their BL fantasies. And by that I mean that they are femcels; cripplingly autistic girls who have a tenuous grasp on the concept of a heterosexual relationship involving them and a guy.
In his favor though, is that a redeemed fujo is going to be very submissive. But to counterbalance that, she's going to LARP herself as the soft bottom fag for awhile, and probably tell you and her fellow fujos about it.