He hadn’t gotten far before McCoy grabs his arms. Having only just barely started to move. Obi-Wan then sits back down on the other man’s lap with a sigh.

“There’s a reason I don’t often drink, my buttons are much easier to push.”

See Bones, Jedi discipline and restraint do have their place! The Jedi in fact discouraged drinking because it clouded the mind. When he did drink it was usually no more than one and he would be fine. But… well. He had let his guard down with McCoy. He would not make that mistake again.