Hi Tay........
Yeah, I'm TS lesbian. Let me get this right.....your partner is genetic male, TS lesbian? If this is the case, then being TS, she should be on high doses of spiro, which, after 6 months or so render you sterile. Besides which, after a long enough time on antiandrogens, that particular appendage does not respond as well, or as long, usually, insufficient for penetration. Sorry for the 'balls to the walls' explanation, but check out the Wiki.
Best,
Bev