For me it's when the uke is confused/hate/reluctant to be on the bottom. Because usually when the uke is like that, the seme will push the uke until he's willing to submit -_- The highschooler side couple in Honto Yajuu is a good example of that I very much prefer a gay bottom uke that's not afraid to bottom and an understanding seme please :)
personally - I really don't like ukes that are basically 'damsel in distress' themed. and *definitely* not shotacon; it just feels so inappropriate and almost embarrassing to me （￣へ￣） reply
