Mine curls more as it dries but I have a daughter with hair exactly like you, we can wet and scrunch and it looks loosely curly but when it dries it's pretty much straight, the nice kind of straight with body and the ends turn up or down. It's great hair IMO. Hers is very thick (lots of hairs) but very fine (tiny skinny hairs).
2c / C / iii (FIA)
Med-Coarse, LowPorosity, NormalElast (LCLF)
Wash: DevaCare Low Poo
Detangle & Rinseout: Walgreens or Sally's Conditioning Balm (always)
Leave-in: DevaCare OneC (budget choice is GFTN)
Style: ReCoil & DevaCare Arc Angel (budget choices are HESMU or Got2BSpikedUp)