A feast of lovely (drunk) ladies? Nice.
Great ending though. Well hey, he may have been suckered into it, but I think it was completely worth it.
Somehow, this actually makes me wonder about the beds in the other room being 'taken'...Any chance they'll come over to check out what's happening, and then add to his harem...? In a sequel maybe?
Nice. Also I noticed the sister still has other friends there as well. Maybe the harem could grow even bigger in a sequel. Maybe even with sister included. 😉
Hmm ... IRL, one of them (IIRC, Megumi) might have, as she implied, 'hurled' all over the place, plus Sanae might have gotten word that her little brother practically raped her three friends ... to say nothing about their interrupting his study time.
In the 'H'-Universe, 'Little Brother' says sayonara to his virginity, thanks to three hot, drunk (to various degrees) and horny "Sexy Onee-sans" (the Lucky Bastard seems to be a Man Of Culture, too) ... problem is, although they seemed to approve of his initial efforts, they're still hungry (wink-wink, nudge-nudge).