Why did my boyfriend show my breast to his brother on FaceTime?

Tell your opinion.
So I have an Italian boyfriend
Long distance relationship ♡︎

He is 25, me 21.
One day when he was here in March. The guy came towards me calling his brother, pointed on my breast and said «Can I?»
I said «yes» (I had jumper on) and then he took the hand under my breast up and down on videocall with his brother? I don’t get it lol
His brother saw him touch me.
The Italian boy (My boyfriend) did it while smiling
and his brother smiled and laughed too

Is this normal to do a girl? And me with no experience, and I have Aspergers.

Updates
1 y
I said yes bc as autistic I can’t always
separate healthy or unhealthy boundaries and
especially from my boyfriend one I wanna be with.
Why did my boyfriend show my breast to his brother on FaceTime?
Post Opinion