Butt
Donatello was definitely an ass man. He loved April's breasts as well, but he preferred her butt.
He was obsessed with it.
He loved the way her waist curved into her hips, bottom and thighs.
April didn't like that area of her body but Donnie was doing everything he could to change that, which included spending a great amount of time between her thighs and his hands all over her.
Her butt was firm, but very soft and plush as well, plenty of skin for him to grab at and knead.
He also found out that she had many freckles there as the rest of her body.
It had taken him a while to build up the confidence to ask April if they could have sex 'doggy style' but when he dd, she had enthusiastically said yes.
Apparently she knew how much Donnie liked her butt.
That would explain the amount of thongs and sheer underwear that April now owned.
Taking April from behind was an amazing experience and quickly became his favourite position.
The only downside was he couldn't see her face, but...
Her backside hitting his plastron, the small slapping sounds that it made, the small ripples of her skin from the impact and just the sight of her ass in front of him did so many things to him.
There was more he wanted to do but he didn't want to push his luck...