A hand bra means using the hands to hold the tits - also referred to as cupping tits.
A girl can form her own hand bra, or her partner reaching around from behind can perform the hand bra. There are many reasons to run a hand bra: To cover the breast from view, to tease, to avoid the effect of natural gravity on the tits, to weight the tits and many others.
[edit] Pictorial Illustration of Various Hand Bra Types
Bistarka demonstrating a typical horizontal position HAND BRA
Lory demonstrating a DOUBLE CROSS-OVER LIFT & SEPARATE HAND BRA
Vittoria demonstrating the advanced DOUBLE HANDED HAND BRA
Anna demonstrating a horizontal version of the NIPPLE PEEK HAND BRA
Scandinavian Renee demonstrating a FOREARM VARIATION OF A SHELF BRA
Mrs2FunCouple demonstrating a horizontal version of a BIGOBAGOS HAND BRA
Angelic Michele demonstrating a Cleavage enhancing HAND BRA
Jamie demonstrating an advanced NIPPLE PEEKING LIFT HAND BRA
Elise demonstrating a vertical SHELF HAND BRA
Juliette demonstrating a typical vertical position HAND BRA
Sweetness demonstrating a reverse angle of the typical HAND BRA
Christina demonstrating a difficult ONE HANDED HAND BRA
A hand bra with a credited assist going to the friend.
A hand bra for the gal on the go