22 weeks pregnant with twins and sexually frustrated

Ever since the bump made its debut sex has been dreadful between us but I'm always horny. He's on top I don't like my legs up I feel like a sumo wrestler, he's behind my tummy feels heavy, standing up and he's behind is way worse, I'm on top belly is heavy and uncomfortable not to mention the twins are moving around alot. He has his orgasms but I don't. The only thing that goes well with our sex life is oral we both give and receive but its like my vagina wants his penis, craves it. An orgasm from cunninglus is great but I like it better from his pole instead. Any advice?