Hi Emily ...
Not quite so straightforward to achieve for a guy ... everything from the clothing to the equipment lol provides its own considerable challenge
But one time in a Theatre box yes .. well a couple of times to be truthful, lol
Not all, but some of the more classical Theatres around London have their boxes incorporate a curtain, usually to be drawn part-way if the occupants feel they wish to be screened from the rest of the aiduence above and behind them but still leaving a direct-forward view of the stage. Lower-tier boxes can still be a little overlooked from the boxes directly opposite them all the same of course, but balcony/circle boxes generally aren't.
A girlfriend and I were in a circle box one time to watch a comedy play, and being in what was effectively a private-space in a public situation kinda got the naughty-thoughts things hapening, lol ... rather like the way thoughts of joining the mile-high club 'just happen' when you are sitting on a plane
Anyway, the first impulse was how great if we could fuck right there lol ...
... but that was way crazy a thought, but nevertheless it was not risky at all to get a little touchy-feely ... had to be from the waist down however as the front of the box gave cover from the stage but not above a certain level ....
though, at one point we did find quite by accident that there was a get-around for this ... she leaned forward in her chair one time and put her forearms on the top of the front of the box, and rested her chin on them to look down on the stage from there for a while ... and just naturally my hand rested on her back ... then kinda slid to her side, down and round, and turned to cup her breast as everything important
was now concealed behind the front of the box
And I played with her for a little while, then still watching the play she slid one arm off the top and laid it over on to my lap and started teasing my cock ... I was already hard from feeling her breast and having her nipple get hard ....
She turned her head and looked and smiled after a little while playing as she was watching the stage ... she'd unzipped me and had her hand inside by then, then had to take me out because a hard cock is simply not suited to trying to stay inside, even less-so when sitting! lol
We were nicely concealed sitting about a foot back from the edge of the box which was at about chest-height when sitting, perfect to see over but at that higher level also perfect to be effectively invisible from the chest-down to everyone else at a lower level - like the stage and the front rows of the stalls
She sat back normally again after a while but still carried on the slow wank she was giving, and then eased a little for a while ... but I wasn't wanting to ease-back by then as I had already slid her dress a good way up to reveal her stocking-clad legs for me to enjoy resting my hand on and looking at while she had been pumping me gently.
And this was where I cheated a little to be honest ... I eased my chair just a little toward the one end of the box nearest to the audience and with the curtain pulled a good way around already, and had her shuffle back a little too but not as much, just so I could still touch her and see her with her dress slid up, and picked-up wanking - still quietly lol, and
very circumspect given the location lolol ....
... and from then it was probably 15-20 seconds at the most before I came sitting in my seat looking at her with the whole audience on the other side of a curtain and with the play going on ... no longer than that simply because of the special situation ....
And by some quirk, at the same time I climaxed in my seat something happened on stage and there was some applause, which made us both laugh
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I loved your experience too ... sounds like quite a buzz for you lol - maybe sitting a few seats along from you in the same row it could have been interesting to watch you and then quietly join in and wait for you to notice
... or of course switch it to a Theatre, one of the boxes maybe?
PS ... check your post about breast pumps