This is so fucked up, in many ways...
The seme is a night diva, an attention w**** that exists only in the eyes of his followers and the uke... How can I tell : he's the fucked up oe in the pair.
At the end, his smirking face is a bit devilish: it seems his aims was to put down the diva and fuck her. I don't know it's twisted and short sooooo....
Just a theory: the S is the actual uke and the M the seme and it's quite a mental bdsm relationship which ends into the seme /assumed S is the actual masochist.
To a certain point this work is a bit valuable but the first scene is almost like rape w/toys, kind of a not a good thing + turn off.
The Uketsu reference was funny, story started funny but ended nicely