Hi fictif59… are you french btw?
Considering the beauty of the boy you got on video 1, i made some little research... and found out it's Mike18 himself !
Spankingtwinks belongs by the way to the mike18 galaxy of websites, as you can see here
The picture set appeared first time on the website in february 2009, at the same URL, but points to the joining form with no other information
But on april 2009, the mainpage would show a 6 picture frame that said : "Teacher is spanking Mike 18. Do you imagine whats happening, when some twink gets caught by his boss or prefect doing prohibited things? Of course he gets his punishment immediately! You want to find out how? Dont waste your time, join Spankingtwinks.com now and enjoy the show!"
The 6 picture demo frame will stay on the top place of the main page for a year until june 2010 where the website is reorganized
Then Mike disapears from the demo frames and we found him only encapsed in the palette image of the tour. In july he finaly re-appears in a caption as "mike is spanked" but the caption in non-clickable and he's still not in the demo frames with free videos. That caption stays in place until april 2011, where it disappears completely.
(we have Mike as a non-clickable picture in models section, though). Then in january 2015, appears the Mike's model page with the 3 other videos of him, but not the one we are looking for.
The video is itself nowhere to be found on mike18.com main website archive, everything's is very well compartementalized and you would find since the beginning to nowadays barely no spanking video on the vanilla main website.
And just for information, quite at the same time in july 2009 would appear "Mike's first set" in a demo frame of Mike18. Funny since Mike18 website and pornstar appeared for the first time in october 2005, at recorded in wayback machine (so that's a least). ie: See the same yellow flower on his left ear on the top of the page…
So the first conclusion is the set we look for is probably older even than 2009... 2005 at least, considering the slight difference of age with the "first set. And maybe older : The pictures and videos may have been made at the dvd era, and they would be eternaly recycled into mike18.com galaxy just as if mike pornstar just got 18yo in the last two years lol (according to model presentation on mike18 and spankingtwinks)
Though, considering the quality of pictures and what i've known in the 90's/2k's, i'd say it's shot between 2000 and 2005, probably more closer to 2005 than 2000.
The second conclusion is the video, in the circuit for at least 10 years, must be popular and thus, could be found on warez/usenet.
So I investigated some downloads from theses sources :
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Usenet, via google groups, but nothing to be found 
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SpankingTwinks Hairy Hottie Spread, Spanked and Sexposed in the Playroom - NOT FOUND
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spankingtwinks VIDEO, where there is a mention of "Mike18 - 06 Spankingtwinks-End (x43m51s) corredit.mpg " - NOT FOUND
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spankingtwinks VIDEO, with videos 01 06 09 11 18 20 26 39 42 44 58 65 67 69 - NOT FOUND
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Spankingtwinks.collection.A, with videos 29-39 - NOT FOUND
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Spankingtwinks.Collection.B, with videos 42-46, 49, 68, 78 - NOT FOUND
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The Ultimate Mike18 Video Collection. I don't think i can find it in there and don't have the courage to leech 26GB
I also investigated on the 6 other set of Mike in spanking/BDSM situation :
