TITANIA
My Oberon, what visions have I seen!
Methought I was enamoured of an ass.
OBERON
There lies your love.
TITANIA
How came these things to pass?
O, how mine eyes do loathe his visage now! (4.1.77-81)
When Titania awakens from the love spell, she has a classic "What was I thinking?" moment. Not only does she realize that she was literally in love with an "ass" (Shakespeare's little joke), she also admits that she can no longer stand the sight of the creature of which she was once "enamour'd." Some things never change.
Quote 2
TITANIA
I pray thee, gentle mortal, sing again.
Mine ear is much enamoured of thy note,
So is mine eye enthrallèd to thy shape,
And thy fair virtue's force perforce doth move me
On the first view, to say, to swear, I love thee. (3.1.139-143)
Bottom has literally been transformed into an ass, but here it's obvious that Titania has undergone a transformation as well. Oberon's love juice has turned the once-feisty and intelligent queen into a silly, love struck woman with no ability to judge appearances. Though we know that Bottom's voice and appearance as a donkey are particularly unappealing, Titania's love for him seems to have changed his faults into virtues (in her mind anyway). We remember that Helena said pretty much the same thing about Demetrius's character flaws back in Quote #4.
Quote 3
TITANIA
Out of this wood do not desire to go.
Thou shalt remain here whether thou wilt or no.
[...]
And I will purge thy mortal grossness so
That thou shalt like an airy spirit go. (3.1.154-155; 162-163)
There's a dark element of coercion here, where Titania informs Bottom that he'll remain in the wood with her, regardless of whether or not he wants to. What's more, Titania is ready to use her magic to physically transform Bottom's mortal body into that of an "airy spirit."