What should I do with KK here?

[Gen Sterling]

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Flop: 7[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/club.gif[/img] ( $33 )
<font color="#CC3333">Hero bets $20.00</font>, <font color="#CC3333">MP3 raises to $91.00</font>,

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First, this guy is described as loose and semi-aggressive, so I can see him having flopped the straight with 69 and 9J suited or not.

Second, the overbet may be designed to protect his straight against the flush draw.

I'm inclined to fold out of position.