The simplest way into We-Vibe's wearable couples vibrators. She wears the C-shape during sex, so both of you feel the vibration, and either of you controls it from a phone.
Hands-free C-shape designed to be worn during sex
Control from the free We-Vibe app, in the same room or long distance
Smooth silicone
Rechargeable
Compact: about 3.1" long, 2.5" insertable
Use water-based lube with silicone toys.