Their Temporary Sub (The Doms of Club Mystique #3)
Mardi Maxwell

Twins, Luc and Logan Ramsey, run Club Mystique, the BDSM club they co-own with their three brothers. They made a pact to remain single until age thirty-two but when they meet Cassie, Logan decides she’s the woman for them and he pursues her. Luc insists they stick to their plan and he refuses to get involved with her.
When the two tough Doms discover Cassie’s being hunted they move her into their home to keep her safe. Logan intends to keep her forever but he has to first convince Cassie to stay while proving to Luc that she's the woman who will complete them. Cassie wants them but can she be their temporary sub without endangering them?