Swapped, Changed, and Claimed

All my life, people have assumed I'm female. I look more like a woman than a guy, but now my professor--the beautiful Tara Richards--is offering me a pill that will turn me into a female. Now that I've got this beautiful female body, I can't wait to show it to Tara. But it turns out that she took a similar pill that CHANGED her as well, and she's got a BIG SECRET that she wants to share with me...