Engaged couples holding each other is a love signal. As is possessiveness when it's not overbearing, jealously based, controlling, or steeped with insecurity.
Togetherness and affection are implied with possessive portraits and it feels correct for many couples. Grab a hand, arm, or leg and let's make magical engagement photos.
I love you. You’re mine. I’ll kill any bastard who tries to take you from me. ― Samantha Young