Alyssa was very embarrassed, not so much for having transformed but for Sophie having seen her first erection. She just stood up as she could, still not used to her new body, and started walking slowly to her room. Going up the stairs she could feel that her new cock was still hard, now more than before. Just thinking about Sophie, the centauress felt her cock throbbing, she knew she wanted her friend but unlike Kayla she didn't have the courage to say it to her friend, so she had decided to deal with her erection on her own.
When she was entering her room, Alyssa heard the sound of Sophie, who had recovered from the shock and was going up the stairs. She quickly closed the door and locked it.
"Alyssa, let me in. I don't care that you turned into a centauress and that you are now a boy down there." Sophie said knocking on the bedroom door
"No, please leave me alone." Alyssa said, fighting the urge to let her friend in and fuck her.
"I can't, I saw that you need help with your new member and you are going to need help." Sophie said
"I already told you to leave me alone. I manage on my own." Alyssa said
Apparently Sophie gave up, since she was quiet outside and Alyssa heard her footsteps moving away. She then laid her horse's body on the ground and tried to caress her cock, but the distance was too great for her to do it properly. It didn't take long for her to hear her housemate fiddling with her bedroom door again, opening it seconds later and walking in with a box in her arms.
"I knew you would be in trouble, thankfully that I had made a copy of your room key in case of emergencies." Sophie said
"I told you to leave me alone." Alyssa said
"As if I could do this while you are clearly in need of help, I even brought some secret little toys of mine, I'm sure this one will be perfect for you now." Sophie said, opening the box she had brought and taking a dildo out of it, one in the shape of a horse cock almost as big as the centauress had now.
"Don't say you use this one." Alyssa said
"I do, and it is one of my favorites." Sophie said and without blinking she put Alyssa's tail aside and stuck the dildo in her ass.
The centauress did not expect this, but she liked the feeling, thinking that it must be similar to what Kayla felt with her arm in her ass, her cock pulsed with the feeling and her cock seemed to get even harder. Sophie pressed a button on the dildo that started to vibrate, then she started stroking her friend's horse cock while sucking her balls.
"That's right, keep it up Sophie." Aalyssa said and continued to enjoy the moment, until she felt what was probably her orgasm approaching, which her friend seemed to notice as well.
Sophie stopped everything, then took off her clothes and sat on the tip of Alyssa's cock, descending so that her friend's member would slowly enter her pussy until it reached its limit.
Alyssa didn't want to know anything else, she felt like she was in heaven, however she was already on edge and soon she could feel the cum coming out of her balls and traveling through her cock when she finally had her orgasm. Sophie also came feeling the seed of her friend centauress filled her womb.
When the orgasms ended Alyssa just lay down completely on the floor where she was, exhausted after everything that happened. The last thing she noticed was Sophie getting up from her softening cock and lying down beside her before falling asleep.
The next morning Alyssa was woken up by the alarm clock ringing, as she had to go to university. Remembering what had happened the night before, she looked at her transformed body. She also noticed Sophie waking up, but realized that her breasts were much bigger, I or J-cup now, and the lower half of her body had also turned into a horse's body. Her housemate realized that she too had changed and looked at her body a little before lifting her rear legs and revealing her own hard cock.
"It seems that now we are in the same situation." Sophie said with a few chuckles