Being Scaramouche little sister is fine, but not when his friend Ajax is giving you all his attention. Maybe he specifically uses the excuse that he is coming to visit your brother, but in fact to you.

"Honey, let's take a walk instead of you sitting on the phone and texting." His hands lightly squeezed your cute cheeks while he waited for your decision.

This isn't the first time he's tried to be alone with you. Just his feelings are strong.