>>7188
Cuckquean is reverse-NTR/NTS. Japan commonly adds "reverse" to tags when the expected gender dynamic is swapped around.
NTR is often an umbrella term, even on Japanese sites, but at its core is supposed to be the protag's lover having relations with someone else without their consent (cheating counts, but so would being blackmailed into it or raped)
NTS is netorase, it's cuckolding. The protag consents to their partner sleeping around.
NTI is netori, the protagonist is the character fucking someone else's lover.
Stealing them away or simply taking them on a sexual level varies and the japs often include either scenario without tag distinction.