My girlfriend! We had an MFM with a guy who had a very large (9X6 inch) cock. We undressed and got on the bed. I went down on her first while she French kissed him, sucked his cock, and got him hard. My neck got sore so he took over sucking her pussy and clit. After she came, his cock was soft so she started sucking his cock. I had my head near hers. She pulled his cock our of her mouth and pushed the head over to my lips. She said, "Suck his cock while I suck his balls, so we can get his cock real hard. I opened my mouth and started sucking his cock. I was surprised at how it felt, soft and rubbery. He started fucking my mouth, sliding his cock deeper and deeper in my mouth and throat. Soon his cock was very hard and his ball sack was beginning to shrivel up. She stopped sucking his balls and turned onto her back, spreading her legs wide. He rolled over and got between her legs. After he put a condom on his cock, I rubbed his cock head between her pussy lips and on her clit. She moaned that she wanted his cock in her. He said, "I got it;" I let go of his cock; and he started easing his big cock into her tight, but very juicy pussy. Soon he had about six inches in and she held up her hand. That was as deep as she could take. They fucked for about 45 minutes before he came.
Thie scenario became our regular process for starting a swing session.