GL with that given Kaede's part of the "open relationships" crowd. Just off the top of my head she's herself sleeping with Anno, Cass (whom she has a child with), that one rich corporate sugar momma mentioned in her Uveto encounter, plus Cpt. Steele if that's your jam... and near as I know none of her SOs are any more prudish.
Literally not seeing where you'd be able to shoehorn anything classifiable as NTR in there.
okerFace:
Agreed that most of the recruitables don't really do much more than take up space though. Anno's your onboard vendor, Reaha starts providing a modest side income and Azra has her expeditions and the resulting steady supply of dodgy space shrooms but the rest mostly just... exist. Blame lazy and/or busy writers I suppose.