Come on guys. Incest? Doesn't bother you? Well if not, rape definitely should. Glad it wasn't that this time at least... still, ew wtf.
Well actually....
The first time could be considered rape, given that A-ko specifically made it so she "couldn't hear" any words indicating her displeasure. Very literally, "I won't listen to you say no and keep going anyway". Definitely her actions in trying to get away indicate she's really not into it to start with.
The second time, with the reversal, maybe not so much because she actually did say she wanted it that way so then it's more a scene they're playing than an actual rape.