WORK IN PROGRESS A boob 69 is when two women suck each other's nipples at the same time. Pretty simple, really.

Nipple69 Sucking Lesbians 05
Sucking tits
Ava Dalush & Marina Visconti are breast friends forever.
Tit Sucking Tit Slapping Nipple Fucking Lesbians
Mutually exclusive.
Fairly lengthy Boob69
Returning the favour!
Licking each others' nipples
The best depiction
Big boob sucking 69
Blonde and brunette
Hitomi Tanaka & Okita Anri sucking tits
Orgasmic Double Boob-sucking
Vanessa and Ryan Getting Lost in a Passionate 69