Mrs K disappears at New Year Party!

Well it was a great New Year Party this year, lots of drink, pussy and tits going around.. Mrs K though disappeared for nearly two hours.. When she finally reapperead and came over to me, giving me a big drunken hug and a kiss I knew she had been sucking cock...I put my hand up her short skirt to find her knickers had gone and her smooth little cunt was all wet and oozing cum.. It turns out her friend Aiden with the BBC was in town for New Year and they'd been messaging each other to meet up.. She of course confessed straight away and said her gstring had snapped as he ripped it off, hence now knickerless for the rest of the night... She said he gave her such a hard fucking with his huge black cock twice before she came back to the party... His cum was still running down her inner thighs.. I was so turned on I had to find a spare room where I could fuck her too... Her tight little cunt felt very loose and stretched.. The thing is now, what should I do to her? Punish her somehow? After all, she never asked me if it was ok to go and let him fuck her this time..... Any ideas??