Trait: Netorare (they are the stolen SO)
A character with this trait is subject of netorare, i.e. they are stolen from their significant other, a very close friend, or in some cases, a close relative. This could happen by someone seducing, coercing, blackmailing, outright raping them, or by using other techniques. The trait does not apply if this character is an unrequited crush or a potential hero(ine) on a different route, as the the close ties between the partners and their forcible separation is important to the netori/netorare fetish.
It doesn't necessarily mean that they are literally stolen, but the negative feelings experienced by their significant other might make it seem so.
Netori/Netorare is more than a simple act of infidelity, but the fetishization of jealousy and other negative feelings commonly associated with it. The one who loses their loved one almost always finds out about the situation and suffers from jealousy and the feeling of helplessness arisen from an inability to change anything. The one committing netori and/or the stolen loved one might rub it in by humiliating the loser in private or in public.
Please apply the (Engages in) Netori trait to the character doing the stealing, and (Subject of) Netori trait to the character whose romantic partner was stolen from them by Netori.