Yes

You see his penis safely wrapped in a condom, the tip heavy with his semen. A brief surge of relief and pride at the sight fills you, before you flop back onto the bed and relax, enjoying the afterglow.

Ever since this morning's phone call, you haven't been able to think straight. First there was the shock and panic at being changed into a girl, then the panic and fear of trying to obtain clothes and hide from Alex, and then the hormonal lust started by the vibrating phone and ending in you fucking your best friend. After that orgasm though, all you feel is a bit empty and extremely satisfied.

Alex on the other hand seems to be getting more upset.

"Oh my god. What have I done?"

Blearily you look up to see him still naked and kneeling on the bed. His face in his hands. What's his problem?

"I...I can't believe I just fucked by best friend's girlfriend."

Oh.

Right.

Yeah, you imagine that would be rather upsetting. Alex is a good guy, your best friend--practically a brother!--to you. If you did that to his girl, you'd feel pretty horrible about such a major violation of the bro code too. You guess you technically DID seduce him, so it's not like it's his fault. You should probably say something to console him.