Sleeve

แขนเสื้อ
K̄hæn s̄eụ̄̂x

noun

The part of Forth that Beam holds onto whenever he wants to hold onto that hand but too shy to.

"What?" Forth asked as he felt the tug on his left sleeve. He was looking at Beam in confusion.

Beam just smiled, his tips of ears and cheeks were slightly tinted red. "Nothing."

But he did not let go of Forth's sleeve.

Tae Darvid Kleepolrerk as Forth Jaturaphoom Jamornhum
Tee Thanapon Jarujitranon as Beam Baramee Vongviphan

And the rest of first season, 2 Moon the Series casts. Credit to Chiffon_cake for the characters.