He's enjoying this a bit too much to stop now.

Tyrion groaned - the taste of Sansa's wet juice would be his undoing. He did as she asked, bring his tongue up to her clit again and flicking it quickly until she was wimpering and crying out obscenities. Her hips bucked into Tyrions mouth and he had to grab her hip to push it down into the mattress in order to still her. He rasped, britches growing incredibly tight just from doing this to her. He teased her opening with his finger until she was hissing before pushing it inside of her. He curved it upwards, rubbing at her inner walls until she was sobbing for him- clenching down on him so hard that he ached with need.