Yubisaki Milk Tea - Miyano, Tomochika

Through a series of coincidences, Yoshinori wound up having to fill in for his beautiful older sister as a model for a bridal gown. Now, he has discovered that he has a liking for cross-dressing, and that by doing so, he is learning a great deal about what it means to be a woman—and a man.

(Source: Tokyopop)
Included one-shots:
Volume 1: Hadairo Soda-sui, Namaiki na Amaashi
Volume 2: Reason

Yubisaki Milk Tea had nine volumes published in English by Tokyopop from July 29, 2006 to March 30, 2010, with volumes 8 and 9 combined in a single volume.