I think it's a kindergarten-level question. You have not yet realized that a girl or woman cannot be “yours”. Fighting over NTR always makes me laugh. Perfect logic: 3-some/harem ending = good. NTR = bad. LOL wtf??!
Toys - if a woman likes it, why not.
Kind of off topic but without discussing the topic of "ownership" in depth (can you really own anything at all?), you do sound a bit defeatist.
I don't think there is anything wrong with considering people "yours", in the sense that you belong to each other and have certain rights and duties towards each other. Your wife is yours because you exchanged vows. Your children are yours (unless, perhaps if you are an NTR fan
) because you created them and raised them. You belong to your parents because they created and raised you.
You belong to a country because you were born there. Your country belongs to you because you were born there, contributed to society, paid taxes etc.
Your house is yours because you paid for it, maintained it, kept it heated. Etc.
If you don't acknowledge these rights (and I realise a lot of people deny this at the moment) you are also set to lose all of the above. You don't own your wife so she will leave you if she's fed up or if someone better comes along. Other people have just as much right to live in your country or your house as you do, etc. But ultimately that will be a very strange and lopsided world. Even in the USSR it was not like that.