Btw I think Astarion would actually rather enjoy "drive-by" affection. Quick, chaste touches he's not expected to reciprocate, that he doesn't have a script to fall back on for.
The fond little hello, you kiss Tav gives him when she walks by while he's reading - his cheek, his forehead, his hair, his shoulder, whatever she can quickly, easily reach before she's already past him
The I got u bro shoulder-clap Wyll will sometimes give him when he stops to help Astarion up during a battle, or Gale leaning over mid-conversation to swipe a tiny spider from the shoulder of Astarion's shirt
The light beep beep coming through touch of Tav's fingertips to his lower back when she squeezes past him in a busy street
The easy way she'll swipe a stray blood droplet off his lip with her thumb when he feeds and joke about his table manners
The brief pause she takes to tuck a stray curl back off his face before carrying right on with their conversation
Just? The easy, innocent tactility that comes from the comfortable familiarity of spending a lot of time together. Touches he never really got from his targets or from Cazador, offered with no hint of scheming or lust or ownership behind them, because they're just kind of second nature to most people.
I think he'd find he quite likes those.
