titty pillow

When you use your girlfriends titties as a pillow to sleep on.
They're way better than your normal pillows, but as a trade off she will say that they get sore after a while, so she'll likely tell you to move off.

"I used my girls titties as a pillow last night, they felt so good to lay on but after a while she told me they starting to get sore so I had to move off. "
"Titty pillow. Nice."