Eren, be honest with yourself. You've always had a thing for Mikasa. There's something about those legs and the way her 104th Training Corps uniform perfectly shows off all of her assets. You barely remember last night - there was a battle and you were had no choice but to transform into your Titan form but you were badly injured. When you woke up this morning, Mikasa was there to tend to you. When she begins rubbing your cock, you realize today is the day that the years of sexual tension will be released. Forget about the power of the Titans and just enjoy this day because it might be your last.