Itchy after every go??

So my boyfriend and i are in a long distance relationship and obviously whenever he comes home we have our sessions

but literally EVERY time after, maybe like once the weekend ends, i get itchy.

We dont have sex, just fingering and oral and grinding. But after i always get itchy! We are both clean so i know for a fact its not an STD. Plus i never let him touch anything unless his hands are clean. Is it possible to avoid this? It seems to be a yeast infection but oh my god whyyy