Littlefinger and Lancel (book spoilers)

[intheswamp]

The preview shows a few Littlefinger scenes. One has him meeting Cersei. Another has him being stopped by Lancel and some faith militant members. He's the biggest pimp in Westeros, it seems unlikely that they'd let him go unless he used a bit of trickery.

My theory is that we have an early scene with Cersie and Littlefinger, where Cersei makes some threats against LF to get him to do what she wants to hurt the Tyrells. Littlefinger is then accosted by Lancel and co. and he hints at Lancel's past relationship with Cersei, which causes Lancel to let him go. We see Lancel looking thoughtful/distraught after this interaction. The last scene of the episode is of Lancel confessing his sexual relationship with Cersei to the High Sparrow. Cersei will have been acting arrogant and proud all episode with the way she had hurt the Tyrells through Loras, only for the end of the episode to setup her upcoming arrest.