A nice little tale with art by Angelo Torres who is still going strong more than 50 years after this story was published. This would have been from towards the start of Torres' career and was probably knocked out over a weekend with the help of rest of the ‘Fleagle Gang’, including Al Williamson (layouts?; e.g., panels 3 & 4, page 2) and Frank Frazetta (figure work?, especially on Dora, e.g., bottom of page 2).
Things don’t look too good for the professor. Perhaps the young lovebirds should have given the old guy a better alibi than "
there are blanks in my memory” to explain their ‘disappearance’!