Nerd joins two dirty girls

Clever but shy lad comes to give an extra lesson to his two gorgeous groupmates but finds them kissing and caressing each other in bed. Sure, he feels very much embarrassed and wants to leave but, luckily for him, two excited cuties manage to make him stay and even to turn their duet into a trio. At first, he does not know how to satisfy two girls at the same time but they tell him what to do and even take good care about their pulsating pussies to get orgasm together.