A sexual act in which you handcuff your partner, (preferably female) to the headboard and dive into her vagina, in hopes to get your whole head inside

A jack off buddy (from 'cum' /'come', meaning 'semen', and 'companion'); a friend that you get together with for sessions of solo or mutual masturbation
Variant of: cumpanion (from 'companion' & 'cum'); jack off buddy & wank bud & JO buddy
Similar to: fuck buddy