We've been into mfm fun with a guy we know off and on for about 4 years. First times were scary, weird, scary, exciting, scary but kinda hot for sure. Much better now, we're comfy together and can relax. It's damn hot fun for us.
All I can say is you might see a side of her you never knew existed. Be prepared for her to get turned on like ape shit with the other guy.
Mine sure did and still does. Now that we're into this mfm fun she has a way different attitude about sex. He's done things with her she would never do with me. Swallowing not a problem ever, anal every time he visits. She fucks us both till we're both beat. Then she's horny as hell for days after.
It's a huge turn on for us and has really sparked up our sex life but sometimes I think WTF ?? It's all good.