feminization ()
Where a male-bodied character is changed to become more stereotypically "feminine", in behavior, appearance, or body. Frequently involves gender transformation, but not necessarily - it might just involve an ordinary male character being transformed into a girly one, or there might be no transformation at all and a character could be forced to crossdress. Mind control, brainwashing, and domination are frequently involved.
As with gender transformation, if the feminization process is not shown, it must at least be strongly implied by the circumstances of the picture - for instance, see post #1719191, where a flustered-looking submissive, girly male in feminine clothing is being put in bondage by another dominant-looking character, next to a shelf containing what appear to be clothes of the same color along with various sex toys and bondage implements. (And the dominant of the pair is also crossdressed, collared, and wearing high heels which are locked onto his feet - making it clear that they're submissive to someone else, and that someone is making *them* do feminine things as well.)
When a female-bodied character is made even more stereotypically feminine, this is sometimes referred to as bimbofication.