The first TG game is from the developers of Body Transfer the title I believe is translated to School Hypnotic but I could be wrong. The site can be found below but as of right now they only have the characters portraits and names listed the TG character is at the very bottom of the site. The second game is Makato's teacher possession I've attached a screen of the TG character and the second link is for this game. The final game is one I believe is TG but may be crossdressing not sure since the site just opened so not alot of info I have also attached a screenshot of the possible TG character in his female form (pink hair) again the link to this site is the third link below.
www.silkys.jp/game/saimin/index.html
yamagarasu.web.fc2.com/o_01.html
www.syakunagesoft.jp/product/otop/index.html