Look at the "c-shaped" couples vibrators, like the We-Vibe Chorus. It has a vibration motor that is held against your g-spot and another that is shaped to hold against your clitoris so you get hands free vibration during intercourse. There are a few other products but the Chorus is the only one I recommend as it has 2 different joints to form into any shape unique to your anatomy and hold into place where you want it. Others I have experienced will slip and slide around or just not reach the right spots.

Your other option is to go with a cock ring like the We-Vibe Verge. It has a long clit arm that will hold against your clit for longer than the flatter styles.

Both options are going to give you a more moderate vibration than larger toys because they are smaller and have smaller batteries and motors. But, for a hands free option, that'd be my recommendations