Valkyrie Smash (light novel) Volume 01 - Valkyrie Smash, #1

Sam Sanderson is envied by many for his job, however he himself didn't seem to like it much. Due to his expertise in nanotechnology he was tasked with monitoring the state the Valkyries, humanity's strongest weapons who all just happened to be made into gorgeous females. Forbidden from even touching any of them, Sam spends his days in agony watching flowers he couldn't hope to touch. However one day all of that seemed to change.
His luck recieves a massive boost, but with it came new dangers, more responsibilities and conspiracies knocking on his door one after the other. Finding himself diving head first into an inter-dimensional mess, Sam realizes that sleeping with robots was the least of his concerns.