There was a dark trigger event in this? The scene is so ambiguous as to be interpreted as used to utter exhaustion rather than rape.
Hell there are far worse choices for isekai rape such as the following (which I do not follow, do not recommend, and frankly wished never to have encountered)
Re:Monster, Dungeon Seeker, Dungeon Kurashi no Moto Yuusha, Isekai Meikyuu de Harem wo, or that edgiest edgelord one; Fukushuu o Koinegau Saikyou Yuusha wa, Yami no Chikara de Senmetsu Musou Suru.