When they see a guy flirting/talking with you

Yuri:

*places arm around you and tucks a hair behind you ear* "So what are we talking about?"

Viktor:

*wraps arm around your waist and kiss your cheek* "Ahh MY GIRLFRIEND is soooo pretty today."

Yurio:

*interlocks fingers with yours and cuddles into your neck* "Let's go do something more fun."