trying to understand

i think its been a few months now that me and my partner have started this little dynamic thing. hes older than me but we both kind of play roles sometimes. i go into a little space or just act like im younger and he steps in as the caregiver or dad figure. it feels weird cause ive never thought of myself as needing that kinda attention. yet at the same time its really satisfying to let go and be taken care of, even if its just for an hour or two. hes very protective and disciplined but i trust him completely. we talk about stuff after and im trying to work through why this is so appealing to me. is it the security or something else? not sure yet