PA28 PLT HAD TRACK DEV AND CROSSED OVER A PARALLEL RWY WHILE IN LUK CLASS D. AFTER LNDG THE PLT DID NOT TAXI CLR OF THE HOLD SHORT LINES WHEN EXITING THE RWY.

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AFTER PICKING UP 2 CO-WORKERS AT LUK FOR A PLEASURE FLT FOR DINNER AT EYE I HAD A CLRNC FOR TKOF ON RWY 21R WITH A NBOUND DEP. MY CO-WORKERS HAD NEVER BEEN IN A SMALL PLANE BEFORE OVER OUR CITY. AFTER TURNING R FOR THE 'DOWNWIND' I BECAME DISTRACTED WITH THEIR CONVERSATION AND SIGHT-SEEING. I ENDED UP WITH A NORTHEASTERLY HEADING AND MY GND TRACK TOOK ME OVER THE RWY 21R CTRLINE JUST N OF THE APCH END. THE TWR CTLR ASKED WHAT I WAS DOING AND AT THAT MOMENT I REALIZED MY MISTAKE AND I BEGAN CORRECTING. HE TOLD ME I COULDN'T CROSS BACK OVER THE RWY WITHOUT HIS APPROVAL. I AM NOT AWARE OF ANY CONFLICTS OCCURRING AS A RESULT. I ALLOWED MYSELF TO BECOME DISTRACTED BY MY PAX AND I DID NOT FLY THE PLANE. I SHOULD HAVE MADE A PLAN FOR DEALING WITH THEIR PRESENCE; SUCH AS A STERILE COCKPIT UNTIL REACHING ENRTE PHASE. I ASSUMED THE TKOF AND CLB WOULD BE ROUTINE AND I PUT TOO MUCH EMPHASIS ON INTERACTING WITH MY CO-WORKERS IN AN EFFORT TO SHOW THEM THE THRILL OF FLYING. ON MY RETURN TO LUK TO DROP OFF MY PAX I WAS CONCENTRATING ON PROC AND TRYING TO AVOID ANY FURTHER MISTAKES. ON ROLLING OFF THE END OF RWY 21R ONTO TXWY C BY MAKING A R TURN; I WAS LOOKING FOR THE HOLD SHORT LINE. NOT SEEING IT IN THE DARK AND BEING CONCERNED THAT I HAD PASSED IT AND WAS TAXIING WITHOUT A CLRNC; I STOPPED ONCE I WAS SURE MY TAIL WAS CLR OF THE RWY. I IMMEDIATELY CALLED GND AND ASKED FOR MY TAXI CLRNC. THE CTLR TOLD ME I HAD STOPPED BEFORE THE HOLD SHORT LINE. IT TURNS OUT THE LINE IS SOME WAYS DOWN THE TXWY. I DIDN'T GO FAR ENOUGH BECAUSE I HAD LOST CONFIDENCE IN MY CAPABILITIES FROM THE EARLIER MISTAKE. I THINK FATIGUE WAS A FACTOR AT THAT POINT FROM MY DWELLING ON THE PREVIOUS MISTAKE IN MY MIND THROUGH THE EVENING.