Body writing/marking
Temporarily marking the partner’s body with words or symbols. This could be writing words like “Mine” on them with a skin-safe marker, or drawing hearts on their inner thighs, or writing instructions on their belly (“Touch here”). Some enjoy more humiliating words if in a degradation scene (like writing “slut” on them – again only if that’s consensually erotic). You can incorporate into a roleplay (e.g., a teacher writing on a student’s skin as punishment). Also stickers or temporary tattoos could be fun – placing dirty word stickers on their body and then taking them off with kisses. The marks are typically short-term (washable), unless you both are into something longer like actual hickeys or even brand/tattoo which is far edge. Likely stick to temporary! The visual of seeing your messages or marks on their skin can be a huge turn-on of “I did that, they belong to me right now.”