Honey 2 Skip

Hidaka Ikumi lost contact with his older brother Tomo at a young age after Tomo was adopted by another family. Now in present time, with Ikumi at 16 years, Tomo had suddenly returned. Much to Ikumi's surprize, Tomo had came back dressed as a woman. Or at the very least, a very girly man. What had happened to Tomo that would cause him to now dress like this and why did he return?