19 scenes per girl since you still get the losers service by beating someone using the same girl as you(in the case of my dominant Lola getting served by someones lesser Lola).
No nothing special. The pre-dialogue wasn't unique or anything to show that she was talking to "herself", but the same bathing area scene like all the others(I presume anyway, only battled Cherry & Lola so far, maybe scenes will change once you hit each reward section/after every 3 girls).