Pillow humping as a transgirl

Sooo i'm trying to masturbate as a trans girl. i feel quite dysphoric doing it in "manly" ways, i saw a lot of people recommending pillow humping, i'd preferably like to do it fully naked but how do i do it without hurting my penis? i will put a towel or something on the pillow to protect it.

also i cant get a vibrator(i live with my parents)

(posting from throwaway because i'm scared to ask on main :p)