I'll be gentle - This line is famous in BL fanverse. It's usually a total lie

This line is famous in BL fanverse. It's usually a total lie. Tops say it to be mean and then proceed to brutalize you.

'I'll be gentle,' he said. Then he pulled my hair and screamed into my ear.

'I'll be gentle,' he said. Then he bit my neck and left a bruise.

'I'll be gentle,' he said. Then he spanked me until I cried.