Sharing My New Fetish

Over the last year I've developed a wonderful fetish. And it was my wife who introduced me to it.
I've always enjoyed going down on women's pussies and clits, and my wife's no different.
This time last year I was enjoying licking her out before I desperately wanted to fuck her. My wife had already orgasmed, and was building to another when she said "You're not fucking me, unless you clean me up orally afterwards".
I agreed but had never done it before. She climaxed so hard as soon as I went back to sucking on her clit, then I quickly spun her over and began fucking her from behind.
The thing is, she has such a tight beautiful fuckable arse. And I just couldn't help myself from sliding my cock up her bum.
She squealed and backed onto me, so I really went for it, fucking her rear hole until I unloaded.
The agreement soon arose when she moved over my body, and practically sat on my face.
At first I balked at tonguing her arse, then my wife gripped the side of my head and pulled my face into her butt cheeks, telling me loudly to lick her hole.
I put out my tongue, tasting my own cum and her anal juices, and it immediately drove me wild with lust.
If I'd always been super keen to lick pussy and I had, then licking, tonguing and eating her arsehole I became totally and utterly crazed for it.
I devoured her arsehole and even surprised my wife with how horny I became for her backside. She began rubbing her pussy and arsehole all over my face, but I kept on pulling her backwards to tongue her rear hole.
Then taking control, I moved away from her, turned her over and buried my face and tongue back into her arse.
Fingering her pussy at the same time, I brought my wife to two orgasms.
We both crashed onto the bed after she orgasmed the second time, then kissed while holding each other. Ending the kiss, my wife asked me if I'd enjoyed myself. My response was to tell her I'd never felt so horny and so dirty in a sexual sense, at the same time.
We had a similar but shorter sexual time in our kitchen two days later. I'd fucked her as she was trying to prepare our evening meal. When I came inside her pussy, she was about to pull her knickers back up, but I kept her bent over and tongued my cum from her pussy. I then used the cum to smother her arsehole in. Pulling her arse cheeks apart, I gave her arsehole a long and very deep tonguing, making her climax that way for the first time in her life.
We ate our meal after cleaning up, then my wife posed a question I never thought she'd ask.
We were lay cuddling on the sofa, as we listened to music. She propped herself up and asked me if given the chance, would I tongue Cloe's arsehole, like I had hers.
Cloe is my wife's younger sister. She'd not long been divorced after marrying too young. I've always known wife and Cloe were close, and I also knew in the past her sister had expressed openly to my wife, she thought I was sexy.
When I asked her why she'd asked, my wife told me it was Cloe who had said "If **** (me) tongues your pussy or arsehole full of his cum, he truly loves you".
Only a year on, its become a passion of mine to lick and suck out my cum from my wife's pussy, but especially her arsehole. And she's only too happy to have me do it.
There was a brief time, I got the distinct impression my wife wanted me to offer Cloe the same sexual pleasure.
Nothing happened, but only last week my wife mentioned it again. I'd fucked her arse having a quickie in bed before going into work. I'd then gone down on her. As I was tonguing her arsehole my wife said "Cloe would love you doing this to her".
I didn't say anything, obviously because I had a mouth full of my own cum and my wife's arsehole, but I understood she said it for effect.
Later the same day, I received a message from Cloe. She wanted to know if she could visit and stay for a while after lockdown.
When I quizzed my wife after getting home, she told me it would be great all round, if I got to know Cloe better, adding "I'd love it if you two were close".
She already knew Cloe had messaged me. And my wife suggested she could stay for as long as she wanted to.
I know it's not a direct say so, but I can't help but think my wife wants to share me with her sister. Or am I reading too much into it.