Alter wants to sleep with new guy...

Okay so I just got out of a relationship with my ex whose alters were abusive. It took me a long time to do it and now I'm getting involved with a lovely guy who I know would never hurt me. When I'm with him it takes my mind off all the bad things that happened, but when I'm away from him I'm just as confused as ever.

I said I’d go slow with him, I asked Sophie (my alter who is into violent sex/rape/BDSM) ever so nicely if she would just stay away from L and not try to sleep with him or try to turn him towards her violent fantasies, but of course she didn’t listen and last night decided to impress him with her best sexting skills, which he enjoyed of course, but now there’s no going back from that. It took us to a more serious level.

I’m going to have to explain to him about my alters some time but I can’t yet, it’s too early, especially for the darkest secrets such as Sophie’s rape fantasies and whatnot. I feel like I text him too much so I’ve just turned off my phone so I’m not thinking about him so much.

Sophie has suggested that he come over and stay on Monday… He was meant to be coming over at some point anyway, but that suggestion was before we’d really talked about sex at all so it was just going to be innocent as far as I’m concerned.

Basically she’s going to sleep with him whether I want to or not… Unless I explain… Which I might have to if I don’t want to get that serious that quickly… And oh my God even if I do explain, and say that I don’t want her to take things further, she’d probably just come out and beg him to come back to mine and have sex with her the next time we’re out together… I feel like I’m stuck in a corner. Don't tell him and he is unaware and sleeps with Sophie on Monday... Tell him and he says he won't sleep with me until Sophie comes out when we're both drunk and begs him to and then he thinks I am/she is a sex crazed freak, begging for sex for some guy I've only been involved with for two weeks.

What do I do?! :'(

Kaz x

secure attachment in a relationship makes any type of sex better.
Sophie do you think that your bdsm would be better if you allow Kaz to have a trusting relationship with L first so that you and Kaz can both enjoy L?
In that way nobody loses allow Kaz the intimacy on a platonic level with L until she's comfortable and allow a little vanilla sex first and then when your with L for a while then perhaps Kaz will be comfortable with that?
What do you think Kaz?

The guy isn't into her kind of sex, so it's irrelevant :/

Kaz x