You felt your own butt inflate after your penis completely shrank, and was replaced with a tiny hole for any alien beast to shove their tentacle, penis, or long nose into, and impregnate you with either eggs, or an alien child. The next change of course was your chest, as you could imagine teeth would come out, and replace your nipples.
Instead, you found round lumps form around your nipples, as they became a pair of large F-Cup breasts big enough to rest on. Finally, once your change was finish, your cadet made you cum through your own pussy, while you were relaxing from anxiety. You have never felt like that from any alien woman other than the cadet you were having sex with. Hora helped you off of the ground, after you had some time to relax, and decided to have the creature you found be a new addition to the crew.