It was wonderful. I had this beautiful black cock in my mouth while Josh's handsome face was around my white dick. His strong hands held onto my hips, while I held his. Gently we sucked in rhythm, wanting to prolong the enjoyment. No bedclothes to get in the way: the perfect 69, hanging weightless inside our spacecraft.
We were well practised, so usually manage to come pretty much together. We sucked and swallowed and massaged to get every drop out. Of course, we enjoyed it, but it was also standard operating protocol, blobs of spunk being unwelcome in zero-g. In our regular manoeuvre, we moved our hands round each other's body to rotate and kiss, while Natasha and Philly put the little garments on us which would catch any further dribbles.
The temperature is kept at a level so that we are totally comfortable naked, which removes the need for clothes and washing. We wipe each other down for hygiene.
It was a relief getting back into space after our time on Mars. We had hardly any sex as we worked on our mission. Lots to do and limited time till the launch window. Now we had little else but sex to occupy us for the next ten months.
Forget "carrying out experiments". Yes, we had some tasks to do, but most things were automatic and the journey was boring. We were fifteen light minutes away from home so there would be no practical phone calls or interactive games, just videos sent each way.
Later we watched the two girls pleasure each other orally. I never got tired of seeing the two of them: Natasha with her stubble of ginger hair and dusky Philly bringing each other to a beautiful orgasm. Sometimes they went 69, but mostly they liked to do it in turns, one hanging on to the other's legs while burying her face in the cunt, the other holding a grab handle to avoid drifting, and gripping her lovely companion with her legs when she came. Natasha flushed a beautiful pink and groaned, while Philly was unrestrained in her cries. There were no neighbours after all. In space, no-one can hear you come!
Unlike us poor men, they usually gave each other two orgasms in a row. I think it was to tease us and show the sexual superiority which we were happy to acknowledge.
They were slim and not large breasted, but how beautifully those breasts looked and moved when free floating! Josh and I also looked forward to the time in a few months when their hair would be long enough to float around as well. We had trimmed and shaved on Mars so we were all smooth, but would get quite shaggy as the months progressed. We were all of modest size, weight being at a premium and height being a disadvantage. You had to be less than a certain height to join this particular ride! And it helped for spare parts if space-suits were interchangeable.