It sounds like the beginning of a wonderful relationship. The only advice about becoming more comfortable with the physical aspects of the relationship would be to start small and work your way up. Maybe do little things with one partner while the other watches, that kind of thing. That's how my girlfriend Selene is becoming more comfortable with the rest of us, and it's how I did it.
"Love as thou wilt."
Company is my husband. I'm dating Selene, Ariel, Vegeta, Thunder, and Andulvar.