Getting back with your ex as FWB on VALENTINES DAY

So me and my ex-boyfriend have been separated for 5-6 months and we have been really close because he is amazing (not only as a friend but as part of my family too - partner wise). 
Now about a week ago we started getting closer and when I mean closer I mean flirting in a non-obvious way to other people. 
Now he broke it off with me because we were living together as well as working together, and it all got too much for both of us. 
As I was saying - about a week ago we started hanging out alone and chilling out. We spent Xmas day together with our family-friends and it was - really REALLY good. We laughed and it all felt... Natural. 
That night he told me it was like "old times" back before we were together and I think we were both really glad it got back to that. 
Anyway... So three nights ago I stayed at his when I was trying to move out of my friends place and we flirted and giggled and had lots of good moments. The morning brought tickle fights, pinching wars and laughing in bed... I stayed there the next night and his room mates (my old roommates - we lived together) all started commenting on how flirty we were in a casual way but it stuck on my mind and his as well. 
How do I know this? Well that night he spooned me and I woke up to his boner on my ass and he made sure he stayed on me. 
Now as we all know in Australia yesterday was Valentine's Day... I stayed at his again and we played black jack and poker with the house mates and we got tipsy - flirty - giddy - and HORNY AF
Two of our housemates had sex (our other roommates best friend(female) and his brother!) and we didn't know until me and my ex were mucking around and tried to fuck. We went out for a smoke to try and let the Viagra kick in and the two love birds kept playing go fish. 
We ended up fucking and it was so much better then when we last fucked I can tell you right now. 
Before we knew it it was 5 o'clock in the morning and we went to sleep at 8am where he spooned me more and then I woke him up and jumped on his morning wood. 
(Unprotected) 
At this point we still haven't kissed. 
Then we went for a shower and oh- damn that was a good shower... After the shower he asked me what we were while he was drying his hair in the mirror. 
"It's your decision" I said to him. He said we will start off FWB and go from there... Really slow (since everything went too fast last time)
We ended up spending the rest of the day together and he has only just gone home. Just as I was getting horny again... Like fuck I bought tequila! 
🍹🍹🍹🍹🍹🍹